.clearfix
    display: inline-block
    &:after
        display: block
        content: '.'
        height :0
        line-height :0
        clear: both
        visibility: hidden



@media (-webkit-min-device-pixel-ratio:1.5),(min-device-pixel-ratio:1.5)
    .border-1px
        &::after 
            -webkit-transform: scaleY(0.7)
            transform: scaleY(0.7)

@media (-webkit-min-device-pixel-ratio:2),(min-device-pixel-ratia:2)
    .border-1px
        &::after 
            -webkit-transform: scaleY(0.5)
            transform: scaleY(0.5)